College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang 315211, China; Department of Bioproducts and Biosystems Engineering, University of Minnesota-Twin Cities, Saint Paul, MN 55108, USA.
Department of Bioproducts and Biosystems Engineering, University of Minnesota-Twin Cities, Saint Paul, MN 55108, USA.
Sci Total Environ. 2020 Jul 10;725:138263. doi: 10.1016/j.scitotenv.2020.138263. Epub 2020 Apr 7.
It is recognized coupling microalgae, which is rich in lipids or protein with wastewater treatment offers extra economic benefits that can potentially make microalgal production feasible by reducing production costs and providing environmental benefits. However, the pretreatment of high concentration nutrients such as ammonia nitrogen (NH-N), total phosphorus (TP) and chemical oxygen demand (COD) in swine wastewater is the premise of application for microalgae in wastewater treatment. This study two auto-flocculation microalgae Tribonema sp. and Synechocystis sp. were selected for evaluation; they were cultivated in diluted swine wastewater together after it was pretreated with titanium dioxide (TiO) plus intense pulsed light (T-IPL). The results showed that the growth of the two strains in the wastewater pretreated with T-IPL grew better than when grown without the pretreatment. The content of lipid in the two algae, cultured in the pretreated wastewater, was also higher than the lipid content from the un-pretreated wastewater; but protein content was lower. Overall, the removal efficiencies of pollutants NH-N, TP, and COD by the two microalgae in anaerobic digestion of swine wastewater (ADSW) with T-IPL pretreatment, were higher than the removal efficiencies without pretreatment. This research also indicates that these two auto-flocculation microalgae have the potential to reduce harvesting costs. And, using T-IPL to pretreat wastewater could provide a promising method for the pretreatment of wastewater.
人们认识到，将富含脂质或蛋白质的微藻与废水处理相结合，除了能带来环境效益外，还能带来额外的经济效益，这可能使微藻的生产成本降低，从而使微藻的生产变得可行。然而，在将微藻应用于废水处理之前，需要对猪废水中高浓度的营养物质（如氨氮（NH-N）、总磷（TP）和化学需氧量（COD））进行预处理。本研究选择了两种自絮凝微藻——颤藻（Tribonema sp.）和聚球藻（Synechocystis sp.）进行评估；它们在经过二氧化钛（TiO）和强脉冲光（T-IPL）预处理后的稀释猪废水中一起培养。结果表明，与未经预处理相比，这两种菌株在经 T-IPL 预处理的废水中的生长状况更好。在预处理废水中培养的两种藻类的脂质含量也高于未经预处理的废水中的脂质含量，但蛋白质含量较低。总的来说，与未经预处理相比，经 T-IPL 预处理的猪废水厌氧消化（ADSW）中这两种微藻对污染物 NH-N、TP 和 COD 的去除效率更高。这项研究还表明，这两种自絮凝微藻具有降低收获成本的潜力。而且，使用 T-IPL 预处理废水可能为废水预处理提供一种有前景的方法。
